And ernest



No Model.) 2 Sheets-Sheet 1.

W. & E. J. DAV-Y. MEANS FOR OPERATING SWINGING BEAMS 0F EXOAVATINGMACHINES;

No. 544,479. Patented Aug. 13, 1895.

(No Model.) 2 Sheets-Sheet 2.

W. 81: E. J. DAVY. MEANS FOR OPERATING SWINGING BEAMS 0F EXGAVATINGMACHINES.

flaw

Patented Aug. 13,

UNITE STATES PAT NT v Fete-n1. 1

WILLIAM DAVY, or KENOSHA, WISCONSIN, AND ERNEST J. DAVY, or

CHICAGO, ILLINOIS.

MEANS FOR OPERATING SWlNGlNG BEAMS 0F EXCAVATlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 544,479, dated August13, 1895.

Application filed June 22,1895. Serial 110.553.71 5. (Nomodeh) To allwhom it may concern.-

Be it known that we, WILLIAM DAVY, residing at Kenosha, in the countyofKenosha and State of Wisconsin, and ERNEST J. DAVY, residing at Chicago,in the county of Cook and State of Illinois, citizens of the UnitedStates, have invented a new and useful Improvement in Operating Meansfor the Swinging Beam of Excavating and'Analogous Machines, of which thefollowing is a specification.

Our invention relates to an improvement in the class of machines,including those for excavating, as in building sewers, for hoisting,loading, dredging, and the like, in which a swinging extension-beam orboom, as it is commonly termed, and which term is hereinafter used todesignate it, is employed for suspending upon it the traveling scoop orscraper for the excavating purpose or other forms of implement for thevarious purposes of such machines, to adapt it to be'carried back andforth between the points of loading and dumping by swinging the boom. Inheavy machinery of the class referred to this boom is of suchgreatweight that an engine is required to swing it, being properlyconnected for the purpose with the boom and controlled through themedium' of clutch mechanism to permit the reversal of the direction ofmovement of the boom while the drive-shaft of the engine continues torotate in the same direction, or through the medium of piston mechanism,one piston serving to swing the boom in one direction and the other toswing it in the opposite direction. The boom-swinging machinery thushitherto employed is more or less complicated, cumbersome, andexpensive.

The object of our improvement is to enable such a boom to be swung backand forth and to be readily controlled with certainty in its movementsby means of a single reciprocating piston actuated by fluid-pressure andsuitably geared with the pivotal boom.

Although our improvement may be used to advantage in connection with allthe various machines included in the class hereinbefore outlined, wehave especially devised it for use in a machine for sewer-excavation,and therefore so explain it in the description hereinafter contained andillustrate it in that excavating apparatus provided with our improvementand illustrated in operation; Fig. 2, a plan view of the same; Fig. 3, asection taken at the line 3 on Fig. 2, viewed in the direction of thearrow and enlarged; and Fig. 4, a section taken at the line 4 on Fig. 3and viewed in the direction of the arrow.

A is a support for the mechanism, preferably in the form of a'carmovable on wheelsr, the tread portions of which should be wide toprevent sinking into the soil. be equipped with machinery for driving itand for actuating the cable-winding. drums (indicated, at D D) tooperate a scraper 0, connected from its forward ,or scooping end by acable q with the drum D, and suspended at its cradle o from a boom B bya cable 19, fastened to the boom at 00, thence passing about the:pnlley0 of the scraper-cradle, over guide-sheaves 10 and 19 provided nearopposite ends of the boom, to thewinding-drum D. The machinery referredto may be that commonly used on cars employed for the purpose to whichour invention relates and forms no partof ourinvention. Hence it is notillustrated in the drawings, though the stack n is therein shown for theescape of products of combustion from the steam-generating furnace.

The boom B, which maybe formed of a pair of channel-bars of metalfastened together in parallel relation, orin any other suitable mannor,is supported on the car-roof. to extend lengthwise thereof andprojectbeyond one end of thecar, being pivoted at its inner end to swingin a horizontal plane, the pivot-pin m, which passes vertically throughthe boom, havingits bearing in a bracket m, fastened on the roof of thecar.- Toward its outer end'the boom carries on its base rollers Z,at'which it bears on a segmental track Z, provided on the.

The car should end of a rotary shaft h, and the cable 2' passes over ahorizontalguidepulley"i' at the opposite side of the car and along thatside to the rear of the car, where it is returned, about a verticalguide-pulley 1' to a drum E' on the opposite end of the shaft h, andabout which the cable winds oppositely of the winding of the cable k onthe drum E. The rotary shaft is supported in bearings afforded inbrackets h, depending from the roof of the car and supporting betweenthem, at their lower ends, a guide-roller h Thus the shaft extendstransversely through the car and projects beyond the sides of the latternear its roof, the projecting ends carrying, respectively, the drums Eand E, and at its center, between the brackets h, the shaft carries apinion f.

F is the fluid-actuated piston device. It comprises a cylinder 6,rigidly fastened to the beams of the car-roof to extend longitudinallyof the car, with its center in alignment with that of the space betweenthe pinion f and roller 7L2, a piston e in the cylinder, having its rod6 extended intoarack 0 which passes through the aforesaid space to beguided by the roller 7 and mesh with the pinion f; inlets and outlets dd in the cylinder beyond the limits of stroke of the piston andconnected by a fluid-supply pipe (preferably steam) d receiving itssupply at o, and containing near its junctions with the openings at andd the three-way valves 01 and d of any usual or suitable construction(hence not shown in detail) and relatively so set that when one isopened to the pipe d the other is closed thereto and opened to theexhaust; and c is the exhaust-pipe,discharging at "u" and connecting theexhaust'sides of the two valves, which are provided on their stems withhandles t and 25 connected by a rod t, which is engaged at its free endin the slot b of an operating-lever b, fulcrumed at one end to the roofof the car, as shown at s.

The operation is as follows: Suppose the apparatus to be employed inexcavating a sewer along a given line on which the car A is caused totravel by its driving machinery referred to being removed, from time totime, backward with relation to or away from the work as it proceeds inthe direction of movement of the car. In the act of excavating, the boomshould extend parallel with the sides of the car along its center toenable the scraper O to be lowered to the line of work at which it isdragged for filling by winding the cable g on the drum D, and whenfilled the cable 19 is wound on the drum D, while the cable is allowedto pay out to elevate the scraper preparatory to dumping it, all in theusual or any suitable manner. When the scraper has been raised, the boommust be turned on its pivot to one side orthe other to carry the scraperto the point of dumping. It will be understood that with the boom in itsposition of extending lengthwise of the car the rack e engages, near itscenter,'with the pinion f and the piston e is then midway sition inwhich it is represented by full lines to that of its dotted-linerepresentation in Fig. l, the valve (1 say, will be opened to ad mitsteam from the pipe (1 into the cylinder to drive the piston toward theopening cl, and the valve (1 will thereby be opened to the ex haust-pipeto permit any steam that may be opposed to the movement of the piston toescape. Thus by the engagement of the rack with the pinion'f the shaft71, is turned to wind the cable 70 on the drum E and unwind the cable t'from the drum E, thereby turning the boom B toward the right to carrythe loaded scraper C to the point of dumping. After dumping the scraperthe boom may be returned to extend along the line of the work by turningthe lever 12 back past its full-line position, whereby the valve 61 isopened to admit steam to the cylinder, and the valve d isopened toexhaust from the cylinder, and the motion of the piston actuates therack to turn the shaft 71. in the direction to effect winding of thecable 1' on the drum E and unwinding of the cable it] from the drum E.Obviously the motion of the boom may be stopped at any point by turningthe lever to a point midway between the extremes of its throw indicatedin Fig. 3, whereby each valve 61 and d is closed to the steam supply andexhaust.

As will therefore be seen, by our improvement we are enabled to employas the boomactuating means fluid-pressure piston mechanism involving asingle cylinder and its piston suitably geared with the boom, which isthe gist of our invention, thus supplanting with a simple mechanism themore complicated, expensive, and cumbersome mechanism hitherto used forthe same purpose.

What we claim as new, and desire to secure by Letters Patent, is-

1. In an apparatus of the character setforth, the combination with asupport for the oper ating mechanism, and the pivotal boom thereon, ofmeans for turning the boom comprising fluid-pressure actuatedpiston-mechanism fastened on said support and comprising a singlecylinder and its contained piston, connections between the piston andopposite sides of the boom, whereby movement of the piston in oppositedirections turns the boom back and forth, and means for controlling thesupply of fluid-pressure to and its exhaust from the cylinder,substantially as described.

2. In an apparatus of the character set forth, the combination with asupport for the oper-. ating mechanism and the pivotal boom thereon, ofmeans for turning the boom comprising a rotary shaft journaled on saidsupport and carrying winding drums at its opposite ends,cable-connections between said drums and the boom arranged to wind incontrary directions on said drums, a single cylinder fastened on saidsupport and a piston therein geared to said shaft to turn it in oppositedirections by the back and forth movements of the piston, and means forcontrolling the supply of fluid-pressure to and its exhaust from thecylinder, substantially as described.

3. In an apparatus of the character set forth, the combination with asupport for the operating mechanism and the pivotal boom thereon, ofmeans for turning the boom comprising a rotary shaft journaled on saidsupport and carrying a pinion and, at its opposite ends, winding-drums,cable-connections between said drums and the boom arranged to wind incontrary directions on said drums, a single cylinder fastened on saidsupport and a piston therein having a piston-rod provided with a rackengaging said pinion to turn the shaftin opposite directions by the backand forth movements of the piston, and means for controlling the supplyof fluid-pressure to and its exhaust from the cylinder, substantially asdescribed.

4. In an apparatus of the character set forth, the combination with asupport for the operatin g mechanism and the pivotal boom thereon, ofmeans for turning the boom comprising a rotary shaft journaled on saidsupport and carrying winding drums at its opposite ends,cable-connections between said drums and the boom arranged to wind incontrary directions on said drums, a single cylinder fastened on saidsupport and a piston therein geared to said shaft to turn it in oppositedirections by the back and forth movements of the piston, openings insaid cylinder near its opposite ends for the supply and exhaust offluid-pressure, oppositely working three-way valves controllingsaidopenings to the fluid-supply and exhaust, arod connecting said valves,and a lever engaging the rod to operate itjto turn the valvessimultaneously, substantially as and for the purpose set forth.

5. In an apparatus of the character set forth, the combination with thecar A for supporting the operating mechanism and the pivotal boom Bthereon, of means for turning the boom comprising a rotary shaft hjournaled on the car and carryinga pinion f and, at its opposite endswinding-drums E and E, at cable 7c connecting the boom from one sidewith the drum E and passing over guide-pulleys k and k at opposite sidesof said drum, a cable 1' connecting the boom from the opposite side withthe drum E and passing over guide-pulleys vi and 4? at opposite sides ofsaid drum, a single cylinder e supported in said car and containing apiston 6 having a rod 6 provided with a rack e engaging said pinion,said cylinder having near its opposite ends exhaust and supply openingsat and d for the fluid-pressure, oppositely working three-way valves 01and d controlling said openings to the supply and exhaust, andprovidedwith handles ti and t on their stems, a rod t connecting saidhandles and a lever I) connected with the rod, the whole beingconstructed and arranged to operate substantially as described.

' WILLIAM DAVY.

ERNEST J. DAVY. In presence of M. J. FROST, J. H. LEE.

